Contents
How do you calculate uptime and downtime?
It is one of the easiest metrics to calculate, as demonstrated by the following formula:
- “Actual Uptime Minutes ÷ Planned Runtime Minutes × 100 = Production Uptime Percentage”
- “Sum of Uptime Periods ÷ Number of Uptime Periods = MTBF”
- “Sum of Downtime Periods ÷ Number of Downtime Periods = MTTR”
What does 99.9% uptime mean?
For example, “5 nines uptime” means that a system is fully operational 99.999% of the time — an average of less than 6 minutes downtime per year.
How many hours is 99.99 uptime?
Percentage calculation
| Availability % | Downtime per year | Downtime per month |
|---|---|---|
| 99.8% | 17.53 hours | 87.66 minutes |
| 99.9% (“three nines”) | 8.77 hours | 43.83 minutes |
| 99.95% (“three and a half nines”) | 4.38 hours | 21.92 minutes |
| 99.99% (“four nines”) | 52.60 minutes | 4.38 minutes |
What is an acceptable downtime?
Most companies strive for 99.9 percent uptime. That equates to 8 hours and 45 minutes of website downtime per year, but by putting certain practices into place you may actually be able to achieve 99.99 percent uptime, which equates to less than an hour of downtime each year.
What does 99.9 mean?
When I say there is a 99.9% chance of something happening, it means that it will happen 99.9 out of 100 times—or, if I move the decimal place, 999 out of 1000 times—which is why it’s accurate for me to say that I have a 99.9% chance of taking an uninterrupted shower today.
What does 99% SLA mean?
Uptime is the amount of time that a service is online available and operational. Guaranteed uptime is expressed as SLA level and is generally the most important metric to measure the quality of a hosting provider. An SLA level of 99.99% for example equates to 52 minutes and 36 seconds of downtime per year.
What is an example of downtime?
Downtime is defined as a period of relaxation or decreased activity, or a time when a machine or technology is unavailable for use. When you have had a busy day and you kick back and relax with a beer, this is an example of downtime.
What is a system downtime?
Downtime is a computer industry term for the time during which a computer or IT system is unavailable, offline or not operational. Downtime duration is the period of time when a system fails to perform its primary function. Communications failures, for example, may cause network downtime.
What is considered good uptime?
Most services fall somewhere between 99% and 100% uptime. The industry generally recognizes this as very reliable uptime. A step above, 99.99%, or “four nines,” as is considered excellent uptime. But four nines uptime is still 52 minutes of downtime per year.